A) The hatred between the Montagues and Capulets intensifies as the action progresses: Person vs person
B) Juliet struggles with her grief over her cousin's death at the hands of her husband: Person vs self
C) Friar Laurence's letter does not reach Romeo due to an unforeseen accident: Person vs the unknown
In the first case, the conflict is that of person vs. person because it describes the problems between two sets of people: the Montague and the Capulet. In the second case, the sentence is describing the internal struggle of Juliet. Therefore, it is an example of person vs self. Finally, the third sentence decribes an unforseen accident, making the conflict one of person vs the unknown.
